flipping matrix

#!/bin/python3

import math
import os
import random
import re
import sys


#
# Complete the 'flippingMatrix' function below.
#
# The function is expected to return an INTEGER.
# The function accepts 2D_INTEGER_ARRAY matrix as parameter.
#

def flippingMatrix(matrix):
    n = len(matrix)
    maxi  = 0 
    for i in range(n//2):
        for j in range(n//2):
            maxi += max(matrix[i][j],matrix[n-i-1][j],matrix[n-i-1][n-j-1],matrix[i][n-j-1])
    return maxi
if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    q = int(input().strip())

    for q_itr in range(q):
        n = int(input().strip())

        matrix = []

        for _ in range(2 * n):
            matrix.append(list(map(int, input().rstrip().split())))

        result = flippingMatrix(matrix)

        fptr.write(str(result) + '\n')

    fptr.close()